Cases, as well as deaths, continue to drop globally, but infections continue at very high levels, with about 3.4 million cases recorded over the past week, the World Health Organization (WHO) said in its weekly pandemic update yesterday.Delta still targeting vulnerable spotsMaria Van Kerkhove, PhD, the WHO's technical lead for COVID-19, said yesterday on Twitter that the trends show a mixed picture, with far too many cases continuing to be reported when the world has the tools to drastically cut the numbers of illnesses and deaths.In a promising development, cases dropped across all WHO regions, with deaths falling in all parts of the world except for Africa, she said.